CN101862699B - Semi-finished pre-grinding vertical-milling and ball-milling combined grinding device - Google Patents
Semi-finished pre-grinding vertical-milling and ball-milling combined grinding device Download PDFInfo
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- CN101862699B CN101862699B CN2010101911418A CN201010191141A CN101862699B CN 101862699 B CN101862699 B CN 101862699B CN 2010101911418 A CN2010101911418 A CN 2010101911418A CN 201010191141 A CN201010191141 A CN 201010191141A CN 101862699 B CN101862699 B CN 101862699B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention belongs to the technical field of cement grinding, in particular to a semi-finished pre-grinding vertical-milling and ball-milling combined grinding device which comprises a semi-finished pre-grinding vertical-milling machine and a ball milling machine, wherein the feeding end of the semi-finished pre-grinding vertical-milling machine is connected with the discharging end of a proportioning belt scale, a gas outlet is connected with a dust remover, and the discharging hole of the dust remover is connected with a finished product conveying machine; the discharging hole of the semi-finished pre-grinding vertical-milling machine is connected with a lifting machine through a vertical milling discharging belt, and the discharging hole of the lifting machine is connected with the feeding hole of the ball milling machine; the gas outlet of the ball milling machine is connected with the dust remover, the discharging hole of the dust remover is connected with the finished product conveying machine; and the discharging hole of the ball milling machine is connected with a powder concentrating machine through the lifting machine, the finished product fine powder discharging hole of the powder concentrating machine is connected with a third finished product conveying machine, and the crude powder discharging hole of the powder concentrating machine is connected with the feeding hole of the ball milling machine through a feed back conveying machine. The invention combines high yield and energy saving of the vertical milling machine with cement grading advantages of the ball milling machine, and has lower investment, lower electricity consumption, more reasonable grading of cement particles, very convenient maintenance and remarkable economic benefit.
Description
Technical field
The invention belongs to the cement grinding technical field, a kind of specifically semi-finished pre-grinding vertical and ball milling combination grinding device.
Background technology
The tradition cement grinding is used the ball mill grinding, and the cement granules pattern is good, the concrete good operation performance, and the building good endurance, but the ball mill grinding adopts steel ball broken, and mill efficiency is low, and power consumption is high.
At present; More advanced cement grinding process is that roll squeezer adds the ball mill combination grinding device, and two kinds of forms are specifically arranged: a kind of is that roll squeezer is made preparatory grinding: adopt roll squeezer to add the scattering and grading machine, back road mill adopts open-circuit grinding; Can improve mill output 40%～50%; This device gets into road, back mill and causes the road, back to grind grinding easily, road, influence back abrasive dust mill power consumption and grog utilization rate because the material that roll squeezer comes out has the fine powder of a great deal of; Another kind is that roll squeezer is made half whole grinding device: adopt roll squeezer to add the V-type powder concentrator, realize half whole grinding, according to the different process configuration, can improve mill output 50%～80%; But because the material fine powder content that the V-type powder concentrator comes out is high, back road mill must be gone up high-efficient powder concentrator, forms two closed-circuit systems, and this device is too complicated; Construction investment is very big, and preceding road circulating load is very big, and power consumption is very big, the main air blower serious wear; Must change in 3 months, in addition, the common fault of roll squeezer is can not change after the roll wear; Can only built-up welding safeguard, maintain extremely difficultly, have a strong impact on system's running rate.
At present; Domestic Vertical Mill mainly is used on the new type dry kiln raw grinding; Tianjin Design Inst. of Cement Industry and Chengdu cement industry design and research institute have begun the whole grinding test of Vertical Mill; But because the problem of Vertical Mill cement granules appearance, and thing followed concrete operational problem and endurance issues, present stage is difficult to extensive popularization.
Summary of the invention
Technical problem to be solved by this invention is: to the shortcoming of above prior art existence; A kind of semi-finished pre-grinding vertical and ball milling combination grinding device are proposed; The high yield and saving energy of Vertical Mill and the cement grating advantage of ball mill are combined; Invest lowly, power consumption is lower, and the cement granules grating is more reasonable.
The technical scheme that the present invention solves above technical problem is:
Semi-finished pre-grinding vertical and ball milling combination grinding device; Comprise semi-finished pre-grinding vertical machine and ball mill; The semi-finished pre-grinding vertical machine comprises powder concentrator, feeding mouth, mill, top scraper plate, reductor, main motor, air outlet, grinding roller, rocking arm, bottom scraper plate and semi-finished product discharging opening, and the feed end of semi-finished pre-grinding vertical machine connects the blanking end that proportioning belt is claimed through belt feeder; The gas outlet of semi-finished pre-grinding vertical machine connects first deduster, and the discharging opening of first deduster connects first finished product conveyer, and first deduster links to each other with first dedusting fan; The discharging opening of semi-finished pre-grinding vertical machine connects first elevator through the Vertical Mill outfeed belt, the receive charging aperture of grinding machine of the discharging opening of first elevator; The gas outlet of ball mill connects second deduster, and the discharging opening of second deduster connects second finished product conveyer, and second deduster links to each other with second dedusting fan; The discharging opening of ball mill connects powder concentrator through second elevator, and the finished product fine powder discharging opening of powder concentrator connects the 3rd finished product conveyer, and the meal discharging opening of powder concentrator is through the receive charging aperture of grinding machine of feed back conveyer.
Like this, grinding material is delivered to the semi-finished pre-grinding vertical machine through belt, grinding in the semi-finished pre-grinding vertical machine; The light matter material rises with air-flow, and than heavy material whereabouts semi-finished pre-grinding vertical motor spindle, the rising dust-contained airflow is fine graded through dynamic powder concentrator; What meet the finished product requirement is transported to the deduster collection with air-flow, and the thin returning charge and the synthetic closely knit material bed of charging that do not meet the finished product requirement continue to mill, and collect discharging opening; Get into ball mill, the material in small, broken bits that the semi-finished pre-grinding vertical machine comes out gets into ball mill and carries out fine-grinding, selects powder through elevator to powder concentrator; Meal is got back to ball mill bistrique grinding again, and the finished product fine powder is directly put in storage.
This shows; Science of the present invention semi-finished pre-grinding vertical machine and ball mill are combined, material are at first carried out half whole grinding by the semi-finished pre-grinding vertical system, and the closed-circuit ball mill system by the band powder concentrator carries out whole grinding then; Thereby make the grinding granule-morphology good, mill efficiency is high.
Technical scheme as the further qualification of the present invention:
The outer rim of mill is provided with the barrier circle, and the barrier circle is that a cross section is L shaped annulus, opens the backgauge hole at inner ring, opens fixing hole on the bottom sides, and the barrier circle is fixed by bolts to the edge on mill top through the fixing hole on the bottom sides.The aperture in backgauge hole is 3mm.Material is all extracted out by wind-force in traditional vertical mill, and wind-force consumption is big, and the blower fan wearing and tearing are big; And after the present invention is provided with the barrier circle, through the material after rolling, constantly move to the mill outer rim down ordering about continuously of centrifugal force; Tiny qualified material is outwards dished out from the barrier circle; The coarse granule material is returned mill by barrier circle obstruction to be continued to roll, and guarantees to have only particle diameter to pass through from special barrier circle less than the material of 3mm, can realize many thickness grading once.
The semi-finished pre-grinding vertical machine is supplied hot blast from the bottom, is 30% of traditional Vertical Mill with wind.Tradition Vertical Mill material 100% leans on the wind-force pulling to move upward; After roughly selecting, process Vertical Mill powder concentrator goes out machine; And the most of material of the present invention's half whole Vertical Mill is dished out through barrier, and through discharging from half whole Vertical Mill bottom after the air classification, the qualified material of selecting through more than half whole Vertical Mill powder concentrators accounts for about 20% of half whole Vertical Mill charging total amount; And the material material-gas ratio of certain granules is certain; All half whole Vertical Mill actual consumption air quantity are 20% of traditional Vertical Mills, consider certain affluence amount, and design air flow is confirmed 30%.
That end that belt feeder is connected with the feed end of semi-finished pre-grinding vertical machine is provided with a tramp iron separator, can before semi-finished pre-grinding vertical, can the iron in the cement grinding material be removed.
The feed end of semi-finished pre-grinding vertical machine is provided with a lattice wheel, can play the effect of lock wind.
First deduster goes out the machine specific surface area of finished products and is controlled at 350m
2/ kg～360m
2/ kg, 0.08mm tail over and are controlled at below 3%.The machine material specific surface area that goes out that the semi-finished pre-grinding vertical machine gets into ball mill is controlled at 180m
2/ kg～200m
2/ kg, 0.08mm tail over and are controlled at 40%～50%.The machine specific surface area of finished products that goes out of ball mill is controlled at 460m
2/ kg～480m
2/ kg, 0.08mm tail over and are controlled at below 1%.The machine specific surface area of finished products that goes out of second deduster is controlled at 400m
2/ kg～420m
2/ kg, 0.08mm tail over and are controlled at below 2%.Control out machine material specific surface area and 0.08mm and tail over and to make the cement granules grating more reasonable, help the thickness grading of abrasive material, make grinding effect better.
Advantage of the present invention is: the present invention combines the cement grating advantage of the high yield and saving energy of Vertical Mill and ball mill, invests lowlyer, and power consumption is lower, and the cement granules grating is more reasonable, and Maintenance and Repair are very convenient, and economic benefit very significantly.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of semi-finished pre-grinding vertical machine.
Fig. 3 is a mill and the sketch map that is connected of barrier circle.
Fig. 4 is the structural representation of barrier circle.
The specific embodiment
Embodiment one
Present embodiment is a kind of semi-finished pre-grinding vertical and ball milling combination grinding device, and structure is as shown in Figure 1, comprises semi-finished pre-grinding vertical machine 5 and ball mill 11.The structure of semi-finished pre-grinding vertical machine 5 is as shown in Figure 2; Comprise powder concentrator 20, feeding mouth 21, mill 22, top scraper plate 23, reductor 24, main motor 25, air outlet 26, grinding roller 27, rocking arm 28, bottom scraper plate 30 and semi-finished product discharging opening 31; Mill 22 is installed on the transmission device of being made up of main motor 25 and braking maneuver property 4, and grinding roller 27 is installed on the rocking arm 28.Material gets into the semi-finished pre-grinding vertical machine by feeding mouth 21.The outer rim of mill 22 is provided with barrier circle 29; Mill is as shown in Figure 3 with being connected of barrier circle, and barrier circle 29 is that a cross section is L shaped annulus, opens the backgauge hole at inner ring; Open fixing hole on the bottom sides, barrier circle 29 is fixed on the edge on mill 22 tops with bolt 32 through the fixing hole on the bottom sides.The structure of barrier circle 29 is as shown in Figure 4, and the aperture in backgauge hole 33 is 3mm.Semi-finished pre-grinding vertical machine 5 is the supply hot blast from the bottom, and the semi-finished pre-grinding vertical mill is interior to be 30% of traditional Vertical Mill with wind, and traditional Vertical Mill material 100% leans on the wind-force pulling to move upward; After roughly selecting, process Vertical Mill powder concentrator goes out machine; And the most of material of the present invention's half whole Vertical Mill is dished out through barrier, and through discharging from half whole Vertical Mill bottom after the air classification, the qualified material of selecting through more than half whole Vertical Mill powder concentrators accounts for about 20% of half whole Vertical Mill charging total amount; And the material material-gas ratio of certain granules is certain; All half whole Vertical Mill actual consumption air quantity are 20% of traditional Vertical Mills, consider certain affluence amount, and design air flow is confirmed 30%.Be provided with top material scraping plate 23 on the top of barrier circle 29.Semi-finished pre-grinding vertical machine 5 bottoms are provided with bottom material scraping plate 30 and semi-finished product discharging opening 31, and material gets into from feeding mouth 21, and the hot blast of semi-finished pre-grinding vertical machine 5 gets into from bottom sides, from the air-out of powder concentrator air outlet.
The feed end of semi-finished pre-grinding vertical machine 5 connects proportioning belt through belt feeder 2 and claims 1 blanking end; That end that belt feeder 2 is connected with the feed end of semi-finished pre-grinding vertical machine 5 is provided with a tramp iron separator 3, and the feed end of semi-finished pre-grinding vertical machine 5 is provided with a lattice wheel 4.The discharging opening that the gas outlet of semi-finished pre-grinding vertical machine 5 connects first deduster, 6, the first dedusters 6 connects first finished product conveyer, 7, the first dedusters 6 and links to each other with first dedusting fan 8.The receive charging aperture of grinding machine 11 of the discharging opening that the discharging opening of semi-finished pre-grinding vertical machine 5 connects first elevator, 10, the first elevators 10 through Vertical Mill outfeed belt 9.The discharging opening that the gas outlet of ball mill 11 connects second deduster, 17, the second dedusters 17 connects second finished product conveyer, 18, the second dedusters 17 and links to each other with second dedusting fan 19.The discharging opening of ball mill 11 connects powder concentrator 13 through second elevator 12, and the finished product fine powder discharging opening of powder concentrator 13 connects the 3rd finished product conveyer 16, and the meal discharging opening of powder concentrator 13 is through the receive charging aperture of grinding machine 11 of feed back conveyer 15.Semi-finished pre-grinding vertical machine 5 goes out the whole grinding of closed-circuit ball mill 11 realizations that the machine fine powder gets into the band powder concentrator; The powder concentrator blower fan adopts inner loop mode, and material utilizes air to separate after getting into powder concentrator; Coarse granule returns ball mill 11 bistriques grinding again; Qualified material gets into the whirlwind tube and collects as finished product usefulness, the ad hoc deduster of ball mill 11 mill inner ventilations, and the fine powder of collection is directly used as finished product.
The present invention after cement grinding materials such as clinker, slag, gypsum process proportioning belt is claimed batching, delivers to semi-finished pre-grinding vertical through belt in the specific implementation, process tramp iron separator deironing before semi-finished pre-grinding vertical.Material is taken turns charging through lattice before getting into semi-finished pre-grinding vertical, mainly has been the effect of lock wind, and hot blast gets into from the semi-finished pre-grinding vertical bottom.
Material is fallen mill central authorities through feeding mouth, and mill is being done at the uniform velocity gyration by main motor, reductor under driving, and mill outwards evenly disperses material, spreads out by action of centrifugal force, makes it form certain thickness material bed.Under the effect of pressure, grinding roller and mill roll material through relative motion.In this process, material receives rolling of a plurality of grinding rollers on the mill simultaneously, and under the effect of pressure, is pulverized.Material is all extracted out by wind-force in the tradition vertical mill, and wind-force consumption is big, and the blower fan wearing and tearing are big.Key of the present invention be in the mill edge designs barrier circle.Special barrier circle will guarantee that through accurate Calculation the bed depth in the semi-finished pre-grinding vertical running is suitable.Through the material after rolling; Constantly move ordering about continuously down of centrifugal force to the mill outer rim; Tiny qualified material is outwards dished out from the barrier circle; The coarse granule material is returned mill by barrier circle obstruction to be continued to roll, and guarantees to have only particle diameter to pass through from special barrier circle less than the material of 3mm, realizes one time thickness grading.From the bottom supply hot blast of semi-finished pre-grinding vertical, the semi-finished pre-grinding vertical mill is interior to be 30% of traditional Vertical Mill with wind.From the material classification under the effect of ascending air of dishing out of barrier circle, the light matter material rises with air-flow, than heavy material whereabouts semi-finished pre-grinding vertical bottom, realizes the classification of secondary selection by winnowing.The rising dust-contained airflow is fine graded through dynamic powder concentrator three times, meets being transported to deduster with air-flow and collecting of finished product requirement, and the finished product fine powder accounts for material charging total amount 20%, realizes half whole grinding, requires the product specific area to be controlled at 350m
2/ kg～360m
2/ kg, 0.08mm tail over below 3%.The semi-finished pre-grinding vertical gas circuit is an open circuit, the deduster exhaust gas evacuation.The thin returning charge and the synthetic closely knit material bed of charging that do not meet the finished product requirement continue to mill.Fall into the material that accounts for charging total amount 80% of semi-finished pre-grinding vertical bottom, collect discharging opening, get into road mill down, require to control out the machine material specific surface area at 180m by the bottom scraper plate
2/ kg～200m
2/ kg, 0.08mm tails over 40%～50%.
The material in small, broken bits that semi-finished pre-grinding vertical comes out gets into ball mill and carries out fine-grinding, selects powder through elevator to powder concentrator, and meal is got back to ball mill bistrique grinding again, and the finished product fine powder is directly put in storage, requires specific area at 460m
2/ kg～480m
2/ kg, 0.08mm tail over below 1%.Mill tail deduster is collected fine powder in the mill, requires the control ratio surface area at 400m
2/ kg～420m
2/ kg, 0.08mm tail over below 2%.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of requirement protection of the present invention.
Claims (10)
1. semi-finished pre-grinding vertical and ball milling combination grinding device; Comprise semi-finished pre-grinding vertical machine (5) and ball mill (11); Said semi-finished pre-grinding vertical machine (5) comprises first powder concentrator (20), feeding mouth (21), mill (22), top scraper plate (23), reductor (24), main motor (25), air outlet (26), grinding roller (27), rocking arm (28), bottom scraper plate (30) and semi-finished product discharging opening (31), it is characterized in that: the feed end of said semi-finished pre-grinding vertical machine (5) connects the blanking end that proportioning belt is claimed (1) through belt feeder (2); The gas outlet of said semi-finished pre-grinding vertical machine (5) connects first deduster (6), and the discharging opening of said first deduster (6) connects first finished product conveyer (7), and said first deduster (6) links to each other with first dedusting fan (8); The discharging opening of said semi-finished pre-grinding vertical machine (5) connects first elevator (10) through Vertical Mill outfeed belt (9), and the discharging opening of said first elevator (10) connects the charging aperture of said ball mill (11); The gas outlet of said ball mill (11) connects second deduster (17), and the discharging opening of said second deduster (17) connects second finished product conveyer (18), and said second deduster (17) links to each other with second dedusting fan (19); The discharging opening of said ball mill (11) connects second powder concentrator (13) through second elevator (12); The finished product fine powder discharging opening of said second powder concentrator (13) connects the 3rd finished product conveyer (16), and the meal discharging opening of said second powder concentrator (13) connects the charging aperture of said ball mill (11) through feed back conveyer (15).
2. semi-finished pre-grinding vertical as claimed in claim 1 and ball milling combination grinding device; It is characterized in that: the outer rim of said mill (22) is provided with barrier circle (29); Said barrier circle (29) is that a cross section is L shaped annulus; Open backgauge hole (33) at inner ring, open fixing hole (34) on the bottom sides, said barrier circle (29) is fixed on the edge on mill (22) top with bolt (32) through the fixing hole on the bottom sides (34).
3. semi-finished pre-grinding vertical as claimed in claim 2 and ball milling combination grinding device is characterized in that: the aperture in said backgauge hole (33) is 3mm.
4. semi-finished pre-grinding vertical as claimed in claim 1 and ball milling combination grinding device is characterized in that: said semi-finished pre-grinding vertical machine (5) is the supply hot blast from the bottom, and mill is interior to be 30% of traditional Vertical Mill with wind.
5. semi-finished pre-grinding vertical as claimed in claim 1 and ball milling combination grinding device is characterized in that: said belt feeder (2) is provided with a tramp iron separator (3) with that end that the feed end of said semi-finished pre-grinding vertical machine (5) is connected.
6. semi-finished pre-grinding vertical as claimed in claim 1 and ball milling combination grinding device is characterized in that: the feed end of said semi-finished pre-grinding vertical machine (5) is provided with a lattice wheel (4).
7. semi-finished pre-grinding vertical as claimed in claim 1 and ball milling combination grinding device is characterized in that: the machine specific surface area of finished products that goes out of said first deduster (6) is controlled at 350m
2/ kg～360m
2/ kg, 0.08mm tail over and are controlled at below 3%.
8. semi-finished pre-grinding vertical as claimed in claim 1 and ball milling combination grinding device is characterized in that: the machine material specific surface area that goes out that said semi-finished pre-grinding vertical machine (5) gets into ball mill (11) is controlled at 180m
2/ kg～200m
2/ kg, 0.08mm tail over and are controlled at 40%～50%.
9. semi-finished pre-grinding vertical as claimed in claim 1 and ball milling combination grinding device is characterized in that: the machine specific surface area of finished products that goes out of said ball mill (11) is controlled at 460m
2/ kg～480m
2/ kg, 0.08mm tail over and are controlled at below 1%.
10. semi-finished pre-grinding vertical as claimed in claim 1 and ball milling combination grinding device is characterized in that: the machine specific surface area of finished products that goes out of said second deduster (17) is controlled at 400m
2/ kg～420m
2/ kg, 0.08mm tail over and are controlled at below 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101911418A CN101862699B (en) | 2010-06-03 | 2010-06-03 | Semi-finished pre-grinding vertical-milling and ball-milling combined grinding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101911418A CN101862699B (en) | 2010-06-03 | 2010-06-03 | Semi-finished pre-grinding vertical-milling and ball-milling combined grinding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101862699A CN101862699A (en) | 2010-10-20 |
| CN101862699B true CN101862699B (en) | 2012-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101911418A Expired - Fee Related CN101862699B (en) | 2010-06-03 | 2010-06-03 | Semi-finished pre-grinding vertical-milling and ball-milling combined grinding device |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179285A (en) * | 2011-03-02 | 2011-09-14 | 江苏羚羊水泥工程技术有限公司 | Single-compartment ball mill type cement vertical mill grinding device |
| CN104003635B (en) * | 2013-02-21 | 2016-11-16 | 高县天顺建材有限责任公司 | Waste heat grinding process and equipment |
| CN104415844A (en) * | 2013-09-06 | 2015-03-18 | 浙江力普粉碎设备有限公司 | Complete production line for refined cotton smashing |
| CN103567046B (en) * | 2013-10-31 | 2015-07-29 | 河南技兴机械有限公司 | Carbon fiber disintegrating apparatus |
| CN105498927B (en) * | 2015-12-15 | 2019-05-21 | 莱歇研磨机械制造(上海)有限公司 | A kind of half whole formula grinding system |
| CN105750064A (en) * | 2016-03-21 | 2016-07-13 | 南通弘亚机械制造有限公司 | Grinding equipment for dry type cement production line |
| CN106040405A (en) * | 2016-07-26 | 2016-10-26 | 新乡市长城机械有限公司 | Pre-grinding vertical mill united semi-finish grinding system with built-in powder concentrator |
| CN108126811A (en) * | 2017-11-13 | 2018-06-08 | 盐城吉达环保设备有限公司 | A kind of iron ore by dry method fine grinding system |
| CN107737642A (en) * | 2017-11-20 | 2018-02-27 | 重庆嘉韵实业有限公司 | The production line and its technique of a kind of flyash |
| CN112108255B (en) * | 2020-10-13 | 2024-04-12 | 中材国际智能科技有限公司 | Vertical mill sand making system with shaping function |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004188368A (en) * | 2002-12-13 | 2004-07-08 | Ube Machinery Corporation Ltd | Grinding method |
| CN101596483B (en) * | 2009-06-26 | 2011-08-03 | 南京凯盛国际工程有限公司 | Material grinding system |
| CN101671134A (en) * | 2009-09-22 | 2010-03-17 | 南京旋立重型机械有限公司 | Semi-finished grinding process of cement wind selection pre-grinding and device thereof |
| CN201768603U (en) * | 2010-06-03 | 2011-03-23 | 南京旋立重型机械有限公司 | Semi-finished pre-grinding vertical mill and ball mill combined grinding device |
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Granted publication date: 20120104 Termination date: 20140603 |